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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4c336705a2a73ec0d94bfd3533d44651a74c4092ec287a35ca12cf53e33d92' 
  AND token = 'vpvWr2bzcouNG6qJx6rweXwZgobK2ETmQIToDg/Z8Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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