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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5814284b304210b03c84b63a56a29784fc438f4ee48f627e9c24b5b6b9aa67eb' 
  AND token = 'ZZkAqg0LFCi7ewcEPSOFE6P1Gk3c2Xlc60UFdV8M/cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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