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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1584eeee6a0baab93696edb3404c1e2f64749c76ed6344073ee6cc13758941da' 
  AND token = 'tKJeTcN/QZQffYBoRzsOoR+93sgECxGoMzs2IhK8ijs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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