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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76478fff9fe5421fcb402a435a9d6b5555be45c30107f4b971e694777981cb42' 
  AND token = 'mXkx+vw49TWLq7IhVF35d1s3Cfu5eQ01RxiR84aU8TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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