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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688e2479332234df65a828218bf1a64497f0bd493a8ea2535281399a75a6086b' 
  AND token = 'AER2vr9ycweSeVRmnDy5hvAySgIzCHwBGPOI29r4vfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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