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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b8ac06aa58243ccf10fee719f2e1cad07696bd1a0419c8768f271d97784e4e' 
  AND token = '79FgpAJP0WctZULeU1PRJSZUVZKlMnIP2CYIFip2H/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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