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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60741032ea6d7d57ca27f06b1b27feeaf9648c62c3327c5c305e1d43ec99c2f' 
  AND token = 'Bskgiaf5MdFJp0EGU1r04jS+B2dvJ5CdVot/QJKUv2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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