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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b904d38861c54a7a5b9ecc1f4328fe10fbe42c5789ec7735bb4d2eb77a0250' 
  AND token = 'hxr2uOutojGCNbU97M9Dt1FHeEXBam7W9BCDqymBBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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