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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309bb7dcea77070a51027b9b4c7179a436cb7487d951b29724bdef9b7c1846f5' 
  AND token = '/769MzbdyMgrd2k0HTj3LMTtPkH1gXdPaX6EBFW9g2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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