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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d56b0952269f8ae726f49d5affae622365b903199d97c6885200d448682c76' 
  AND token = 'zeYZZVvAjJ/mTgk6kS8Unz+o7zM5dhWt9x9zv20qZR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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