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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c492fc255a7a754c5d6a89f799d2370e8f78345c4793f6d216cc9b55fa2928' 
  AND token = 'TQZkVgexUib+7W4uN0jbTPSd2MH3Do4WZx0UrzFBRFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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