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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb36a2f40e569ed383cc73aa326023ae2d0e9bfd63ff71f2499ebcd2d48d9945' 
  AND token = '32tSJpOVTqSZH07p84OE1P8GLQ0tIAHT+r9dyXuUolo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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