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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3c85c759dc10349be4df72fe7b8ab20e50e02911a89e89cd5f0d56ca60c20d' 
  AND token = 'LwpcxW9JVTKLYLYASaZeRuMNVkUDSK+2L97+t1IUT2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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