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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753415ee998c7b74dca4824da983e3bc494a766931c8f11991b9db4371bff117' 
  AND token = 'wlOqV/mk01tOvOOk3YWUp7yKO8Y/afFuUKY++Vk3O6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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