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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368b1c1c785ef5b939e111f56f8db700bd0373e63c7834341d4ba49fad658b91' 
  AND token = 'Ao8kLhBTOxSN7NaIYtD5ykRcEszao4BzpJaBIo70uJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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