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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08b6d93d425935c10aa86a4ebdabeaf4cfe251ec26b206932470ffb696d110d' 
  AND token = 'g9gZeprz+H3E9t843DZQymc3gQ4flbTB2dhDNGHwGc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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