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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f58f7c332cd9f80c3d95bc4f3b1e52d2aef842bca7fdf4089874bde97c0bdb6' 
  AND token = '7fkHbgOQ6IQuQISG2qo/7upQztrQLEk7bgBc58ejOcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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