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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beec828ff7c9d9b33219a6e5856fc1c2504b60ef077152805814517240c9051e' 
  AND token = 'K8sVKDrrJW9LqzkUbR+qayL/m/l1T+41lBdkE9JX7kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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