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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b7d4cc72dfebf8615640fc5358a40e4639233523de400f43c43575c88e7c7b' 
  AND token = 'aQxzA2ix4R6sVT5xS4CEXbt6mr60gFVQznV8b854s3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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