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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dbee234cc20f6c35d240efa28b70fcb46c39dfc6f88cb1faa408c2718052ba' 
  AND token = 'zuNmpOIQm5yDmScMfD1zJdpAZyWGWZh7iVzql9a3K90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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