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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1fa19b739fff616c7dad7caa9fc73c0b971a93a09151eeded049a90b4318a6' 
  AND token = 'XjjOk+QvGsdZgI3v99DAsFHklPONZLxadE8MQE7hGtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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