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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8476ca5aa5bbb4473016e7f9cde3ebc8e771c480352def3d7b1addc486c9bf' 
  AND token = 'TchaYrDfmL8lEs/vr8xEPbkfMqoaoW6ihqGrXI+/cfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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