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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce8f4a3d56dcdc121fb63073a4779a4a76daf4afb3933a7df650f408f996f07' 
  AND token = '/dRkbI9QpJOsUwe6PPyX5oH/9M7UO6R9zPLhKOy9i5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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