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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ae2d2c4b7587132d201c569bba748ee48732bd1b17fed9ecbf5add44ddb2af' 
  AND token = 'AqzIzy3H+r219RKYboNhQtvut4qnhmFcRg8dDaUmMOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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