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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14b303f27fe87ed360bf75273c14ae46a6c2b6cdfc4dc9df420e1f10b51d9bd' 
  AND token = 'msxKNqpnRwz1fj2T2TbK8B7VlCgaJ6Wtvt943o5AF5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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