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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e83ea7fdc705d93a111bcaf5b9e758358fa1cc3e0c10683d2672bac5aa9baff' 
  AND token = '5+JnNqZdqDoAl5oTNK7DoHTOTPijBN7mMqy1PCdj8JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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