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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a094b564dc804e5dd77d3666c3c5f7429952a5a1a325f997553ad08e1ece0a' 
  AND token = 'KwRmWIBwO7U+Xq8e7mfDz0I4Pse7R4KZu9Ivn4rwHHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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