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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb92fb271f83ad6b0f07ebb83a89be12caf12709dc93ef117945c3c6f8b0e96' 
  AND token = 'S1v4YqpZhT0PLjTv5z9Naa74Gnd9pPmIxw5hcu0NPk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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