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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fefad3537495d22fa2f50a2b628c2eba1a7c0355c93fa552c7d44005a64d0d2' 
  AND token = 'OwD62rOVydTk+NulliNPGIO2Ujbo1IYS+8lySLu+YFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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