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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12d5be67b47bb7c6cfd2adc668d265cb7a9888e85a0407ad42ebc5754b294e9' 
  AND token = 'Rf145RxQp08EZOCpgAWwoycIzs3sbavMb89+hsUL8QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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