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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235d3889cc8412a8fbb97efaab94bcd3a0de9201a094e140220f1e00de48668c' 
  AND token = 'hhOJkq57dCX8rgFIkA/FRnNg5+OhEn1wpXsFk46g/dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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