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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c51ec670c15f5dc1bbb9c2c358876685ad65d1b1a053cc6b7f96edbb262558' 
  AND token = 'u6f7x3YixQBoHOBYynUelq/Yu3TQS5xNYVcUmi+gVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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