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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4114bae31b787be9291114dec38f85708505000d73119a54679a603546fc88' 
  AND token = 'ionUwKoOWo3K0qxtdDi5BFedKhNa6x5j2ddmM2HbOPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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