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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7708227d4563e08a503a89aecdc84fc025c79622614d7737357e831439bc068' 
  AND token = '31A55rfsGKxnAYH8Ctp2X5Aj3gN7ox6db1zDCdlgAyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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