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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893b6d665967105f7e189b5fc91d16d78b983126b861dd257f14d68aedcbfc3f' 
  AND token = '6C0atsh+pD2RctdNFtZNT7o3znyLo0+bKPEBwn+5Xo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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