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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed65118be6d74297f92d01fae30a472e7ae1264bfcccde29a2883203fd8ddf2' 
  AND token = 'gRTwA4yL0bKJ4hpFFcg+xOOCIMiQiXZGemkjoOCEDVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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