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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b2f53324f6e674835925fc8aa03c4e844fa5a6227e1bdbcc9083a18b2c5d64' 
  AND token = 'cXpBXJQUrFBk/UdEUd/m97v/fUy93kAxrpCZnUfo7Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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