SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbee088d3c736ae1ee80d911678a74a492ec5b1cd85f9ef311dfe55cbbc4fd3a' 
  AND token = '3CqqLHOPZBQVJmFCOVrqCKgl7+OMVhsKQOv4vcG9tEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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