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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d109ac7922df6e07df3c7dedd6890f480803a86044db5b6ce4e2241f62c2fb' 
  AND token = 'DtbxHZjtlfoodo5H7QUWg91nPhPn5Lp4wDHsE30qV3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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