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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb869fc01efa604459ea6830bb95a8a76ccef6be6aebdaa37057922d60623e7f' 
  AND token = '3UxdUSjlPjxLGdMDwjJlQHD87g6csY4qMkg+YMF07qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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