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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c99236cffe73e54db140d8da9c6b7d03afe3fa1bd874be17c3fd21b9a6343d' 
  AND token = 'b9A3Z1v5cvveK7khnDL01IWM7ca1JaFlmEjDdmxbndc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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