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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcadbedb90f66e9d11035c8412456b675980235dc839d1d143f2e1810b6524d' 
  AND token = 'SkalMllj8vklDjdA4GdKSGEnVe2Iwvp1UOYBXN/p4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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