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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddee4904e00f5477d330cfba47d2543b38364ac62dc3bfbd81690b5c56dcaa9' 
  AND token = 'MnHcVP2O6yNFzGiQDC3L9XyuAVhL3UV8TQbWCmZTkW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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