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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e77ded23f249678aa3ee655542bd39cc880647aa662e4c514e648520042e96' 
  AND token = 'Km/kaloYqnVJ7BGv64cp1S68KMDXsu03BCTsblPnkdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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