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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d7a569549a054768efcee4ce67bbabd2733b42f28ce5458c2fdef0d812d2bb' 
  AND token = 'ulnxyhd+5fWlsBrDUwH0xIEKIq22oVlvW1afWDCxTAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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