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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922aeab7a44f306c5af64566b0709134f58ef8139e53e0f67cd5a2f73f197869' 
  AND token = 'nLdquumonZssTn7VYZx7hdgtMrs02Vc9bQ2+PPmfIrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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