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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88dea049962c0688b67f2a2a38a70793a22c3f9da370987a16c935811f3ca9a' 
  AND token = 'tsnpFxGe11zTyLWxMEULWmWDP5pxQgg/Fs0v91UkeGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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