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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1f7d475eec6eb5d8ecc5845ccac6717c2f904f52e937e5af14505d6c6c1b08' 
  AND token = '/umSj0oExaWRnCve996zQRFPEs6MUFEQ1ftV7R2v0ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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