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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c3273d0fab0e1b69d1ae9ed46e5f921e8e6c69ddbe2a2c1f5be27fc8c93681' 
  AND token = 'KI5ZVg8gcqTJzIpHLzKUbWjIL1/Iu1rhgsYHrEI0HxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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