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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0d7aaaa6d2e690ab53634a8088a5d766c5b19463607791ee7b7b3f2d77703c' 
  AND token = 'kGnx5xexJ+QQOfwaYimAqJ6GH7oVVMeDfC83FXNTlCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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