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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d29c74c2dc779068a493a63ae7f6dc956b2f30f8a8ef760a3c5f9594a9c6b69' 
  AND token = 'hTw0O3oSv4wtkCTZsdMV8blj8fzh4SW9tgmOmj938c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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