SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0551a4ec2387912b9bd005819fce2dcfadddaf93d9626974e3b1f3e589f79bed' 
  AND token = 'HTnNzUvHaZZvczJX0ZCEephpr9Pl3s+VylLF2FOuKwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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