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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a05d257ad871a218f371c1a8f51d402b1d2a13dd69806767b2fea56551da0f' 
  AND token = 'RWrViY7VSMZJtog1LPIDZ+9y/LLypz2GHbXskPkkB/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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