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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907ac644ee5f44383ed2d1f10fce6d7d599fc80791df5afd585025c96b127f64' 
  AND token = 'LwS+c08F4tMmjzD1OBA5FlY6EUhozkAGgL+wlr5UmEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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