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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1996a664531875e7c46cfd92b0f05a84f9a4c91d94d002b5da2be912716ad1' 
  AND token = 'nhv97Pf0cOe2jWKgGxQhJT+jTDgd6QnQv1wkfBJLjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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