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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c739b39de298a1b02fbf272a907e359cd6a062c6a5d8f7895dfda262efa3ac6' 
  AND token = 'wN6DanjCc342hu78d4P/SO+hhMLAc/g5OqYtNp1XIzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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