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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbcce6beef4f63c34eb17c7085b6636b6539121c40a38dc78b452bc5bfc09f1' 
  AND token = 'x53EYbRghujAwoMEgi626YxGXPCgarI6F+/RuaBm4EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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