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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686a213fea008d299639c61910436242c54683a060ce7da0074a7641b9b6467b' 
  AND token = 'xGpwpcApCoKAx0yJBP5p8pw9NUEHq5y8PtETyUypfpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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