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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98719f336a71f2394b121163c45ad75875ebd04e9c15e7e8ea3eec3106e3ca23' 
  AND token = '7cRVXWXn6lD+Yawdp2EDJOvqqftucKhcfB/tepQXTSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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