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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba665f51fc2fb7e904bcbbc8a70931a5e74d88894983457e31106b23a6436923' 
  AND token = 'AdybEk1Qz7VRTDKUxzP5zUKt3qWU3Ggj3KHJ7hjty9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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