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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ba54dfc78520d235da14a1b90a7c6b996108725afc6f621934e3e1b9ee497f' 
  AND token = '5uctkVBZiUaGyOPvXuW4K9NBRdb7PQ41gwFbbD+GBH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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