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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49840053d12d36b14adc8d2e24de8fb7436379601bfac062daf4efd95d761197' 
  AND token = 'L2jJ3r/kWvngf39TZSyPnL9n4smORTgu1NYMauBgruM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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