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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3971236da3f57c39d78f82316071a1202193efb109e500c9aebb0008fc493c41' 
  AND token = '8ACjtJyuzuVZY7mIN03zUyUvvbx6r1ylZM37T4X17Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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