SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178a4a2feb3395bec1ac70816bbda9d19ecb7900c2b8657a1843aca3b5f21920' 
  AND token = 'BKSvClifv4XZWg2V8mEOCZE++hmm6SxTAj/m6t/YrHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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