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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de8fde538cfb070bf4c8e755c8cb66da27317373394d3f41ee7597336f148c5' 
  AND token = '15HrYyHZK8PAPstOt0n3yJsKQ1hAEN9cUqE+4SMDDEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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