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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92537ffa55f55227a33b154ecbf9451bc1e4a98b3dbded3d73087cc59a8217ac' 
  AND token = 'zdix38kcEtCLf0Q4LZSRZfwnd82A/g7mCcG/bBCqNJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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