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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580fdbdb5b5ec41a0cb8785b031a3668dd1c4723b9082cb8b930554492cbbbb4' 
  AND token = 'dv811Qfw09W9bBoPe67CCno+iXlMeUpMRmoYIvZ+D+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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