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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33faa515442fe8f0dde667c7d3b3b59b1d22c4db4f9af94f699815bf15ed94ac' 
  AND token = 'mZhVEAtha6hQiFqFlGoc6PyJyouxCnA+FzyLJ0nNNhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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