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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c831341680b5bd55a08147fe1ad0b799ced95c66a10ec087e3f1e0e487d104a2' 
  AND token = 'qlaEqcdkQTt8EflYczDKgUIyT3iiDZMATIdy9Ai2EXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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