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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b326c7523c64b15750b1a68b6f30ed7e548ca95285098bcc29b04c6f3ae92ece' 
  AND token = 'XIstnj2pn1sIx4X+6neIt61Imbo0Pru+3jEinYJhbxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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