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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9b56f3d9cae40a23f7c25e8a2e2bc1ce21c9f7efd8a4e73e22a204ae1ec637' 
  AND token = 'daJ2nIgTdRi0n5uMpcRI9TBWg2qkumN1uD8pYqh5l2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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