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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a25c93971812c5ffa4e4631e4ec59fdeff128cb72d33ffa59542ef80b062dc' 
  AND token = 'h96r8RLhbp1oV4fTHvP/MfOkGHjhKJX3SXg0hZMyy18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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