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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1febaad6005c3ad47747414accd1b3b3ef1a060c718a6ae472336f761b9e40' 
  AND token = 'BbLFAswEcdv5qOHluKaSf67F+60gLIYtSM1UAspxAiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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