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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c493686804e5951346d9f39f9ef4e42286d75f949eeada152fa38f874dc8fc' 
  AND token = 'p9D7Zwk9p1e3XJb9fzaQfOdGam+ka0v9IVakQAXvYNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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