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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf74a3d7cdc02bee240354244454f16b60fba86281f9aa6aa4c6c88c99027e4' 
  AND token = '1PcFgQVG1lWW+YdKOZmbUGtCxAs89/g8NusC+iQOQds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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