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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbaf66a97ca0becb21604d14637a30fe38bd33a18ef2b0f33b67dcb2a69bd39' 
  AND token = '3G90gJ2tQWDCtiw3RY2mD+x9cc+iek3rxkLd/8SLBZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}