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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dde1998f140df62070d14cd0518f3ddaa5dd64f66566e76de231a5e5a84f5e' 
  AND token = 'EdiSSXU1xP7LCRsdEk+isRJ/P2U7YluFp3pok61CwJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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