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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd831fd4f84b33483e9ec83eac49009c7e55c401b65ef82c4c0a9e4d0fb9f5509' 
  AND token = 'Rm0ff0oX9mWgTPpuUBh6KndqPBNeJrEByif9vcVYa1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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