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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4199d7d95aea54efb46ddac635ddb1a4aa4836fe1bed7a242a84ee3fc0a48004' 
  AND token = 'sFr/R9fQUX4pcZLMIsDJ6Dke8lGjtMXRUEmeYtO4b9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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