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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34b1e9478b84d46a0e27ec578735285a1406944166027dc5a19559ac55bca86' 
  AND token = 'tLewGB4SOI65zT19011EZcw8rJMJDnf5K0r6kNFxHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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