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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b701db60e7512f695c715dcf597bb4c0bc72536fc44b085863d08c0dc980c8d' 
  AND token = 'mdYvLvO5J5XZWHVy8FsKJkim10XVk1t8ELOV14cJRE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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