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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fb49b7e3f67e148f3860154723392488b069a0ad755cdcb77c9b2007da6451' 
  AND token = '9+Hi6CxkeT3cg/lGDK6w5Wrsg5H+XlLBJ+MWn39eRAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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