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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5464227af9812ef1a6660bb514511e9ff2e4a7a8f8b027fdeab0ed43a598e5bb' 
  AND token = 'Afd8x57PYq+ZzfOzJttUZladwXoS6QaQN+mCsWETh9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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