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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3c9b8711c6e1394cbb0c8bb9de0bbe353af47e39aae3df504986b857040f7d' 
  AND token = 'WH3jcxWyw03iEeebN6JpmX/FkjuDzBBAMTnEpay3z5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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