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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd39f38b07a9a415f5993e5c361af8eef24d6f49d27ad033ff971a6a6367616' 
  AND token = '9mBam6KNxcjSirMvwwPh0/dr9BQP5HFiJk0hCXstOH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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