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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd2c583150320b18dd27273b7f03faed1e9a3dc3c3bb362320dde2f10a70ab5' 
  AND token = '9HyEMjYiVng9ChybuSjM1b5RU0/TgJTaqouOPaxDzOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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