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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7041a8a8b9d05d8d9d55cfca39e3a230c7e9831d89cd7adec8dc3f84404e4f16' 
  AND token = 'ogwD7/FYXGU+aLNQ3R4UK9HoEtILD9q35lwoKFDaS98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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