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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e3a32eebb9f8da2471e6aa8b179635920b5d8ade82d022010924125eee00d2' 
  AND token = 'g/8Ck8RXEx7sAf9tKLvCZAaSzlKqPAWpv46gn+kWTX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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