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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa6bf419eb3a52aa09936eafcf49a0e3c5e5b7aa48a1bc1b51e7e6ce7fe6a49' 
  AND token = 'xEBALqN5BF4ItrBsLuhGNcIrr4lAp2ZL/2PF4Ni5lf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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