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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a9209f5df3bbd8804d1b9ed6ae3e2afb10b98f333b621cad4cbc7b12de9acc' 
  AND token = 'FbcJ1itVLFTs7/48AzLcPUc5MMn8+bFQ6gz4nzbn+qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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