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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da22cda9026f6ee9c68663106a7509fe209aa5f6107a393453981a1ce0cdc4de' 
  AND token = '/HeAgcoqn8bPklhzbx1jljmOMnzCZIXh/H9HyyveLI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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