SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c57987766322c9f4fad2450b36f9d013ee9a0416b7bd7327ae3f26cda23af8' 
  AND token = 'xZlH7oWqkihPjDxlpSFhTdWILPwYPxZ5qa1kRGIJ9BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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