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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a64907943dfacbe5d172da1c3c77a9dbbdf9f5c54eb6bec3f6afd4a80e17248' 
  AND token = '4Ta5/9+/XibPVOv5fBIliPsIFEtBimN6oiDQHQx7mYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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